Endmills are a type of cutting tool used in milling machines to create precise and intricate shapes on a workpiece. It is a cylindrical tool with cutting edges on both the bottom and the sides, allowing it to cut in both axial and radial directions. Endmills are typically used for contouring, slotting, and pocketing operations, and can produce complex features such as curved surfaces or angled cuts. They are commonly made from high-speed steel or carbide, and are available in a wide range of sizes and shapes, including ball-nose, square, and corner-radius endmills.